MODIFIED POLYVINYL ALCOHOL AND VAPOUR- AND SMOKE-PERMEABLE SYNTHETIC CASING FOR FOOD PRODUCTS, CONTAINING SAID ALCOHOL Russian patent published in 2012 - IPC A22C13/00 B32B27/34 C08F8/06 

FIELD: food industry.

SUBSTANCE: polyvinyl alcohol powder with hydrolysis degree equal to 70-98 mole % and 4% water solution with viscosity equal to 3-30 cPs are loaded into a mixer for dry and high-viscosity materials; concentrated water solution of sodium peroxide and/or potassium peroxide and/or calcium peroxide and/or hydrogen peroxide is/are introduced (while stirred) in an amount of 0.05-3.0% in conversion to pure hydrogen peroxide. The reaction mixture, dry by touch, is stirred at a temperature of 45-100°C till almost complete expenditure of the peroxide compound with formation of modified powdery polyvinyl alcohol. This polyvinyl alcohol may be transformed into one of forms suitable for extrusion by way of essentially non-volatile plastifiers addition into the alcohol and subsequent moulding operations. Another aspect of the present invention is one- or multilayer vapour- and smoke-permeable synthetic sausage casing containing such modified PVA and polyamide material at least in one of its layers. The layer containing modified PVA is extruded from a mixture of polyamide material in an amount of 10 - 95.5% and modified PVA in an amount of 4.5 - 50% (the alcohol produced, in one form or another, in accordance with the method according to the present invention) as well as additives in an amount of 0 - 40%.

EFFECT: according to the invention, the casing has a higher degree of transparency and minor opalescence, has low adhesion to mince and the capability of easy removal from sausage-and-wiener goods.

27 cl, 1 tbl, 17 ex